package apIExercise.collection2;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class SortInteher {
    public static void main(String[] args) {
        Random rand = new Random();
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            list.add(rand.nextInt(100));
        }
        System.out.println("list原始数据:" + list); //无序

        //sort() 排序
        Collections.sort(list);//排序
        System.out.println("list排序后数据:" + list); //有序(小到大)

        //reverse取反，从大到小，数据也发声改变
        Collections.reverse(list);
        System.out.println("list反转后数据:"+list);
        System.out.println("第1个元素为:"+list.get(0)); //输出第1个元素


    }
}
